allow Symfony 5

Author: Christoph Singer

composer.json

@@ -14,11 +14,11 @@
     ],
     "require":{
         "php":">=7.1.0",
-        "symfony/dom-crawler":"^3.4 | ^4",
-        "symfony/css-selector":"^3.4 | ^4"
+        "symfony/dom-crawler":"^3.4|^4|^5",
+        "symfony/css-selector":"^3.4|^4|^5"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6|^7",
+        "phpunit/phpunit": "^7",
         "wa72/html-pretty-min": "~0.1",
         "mikey179/vfsstream": "^1.6"
     },